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Trying to tidy up the POs handiwork in my 78 auto, and found this under the dash, next to the steering wheel, screwed onto the rear face of the metal dash panel.
The Black/blue and blue wires are plugged into it.
looks like a resetting circuit breaker maybe?
I don't think it's stock, because the screw holding it on (that's also holding the black wire) is a self tapping screw, so the pointy side is prime knee-stabbing height.
See if them wires lead to the windshield wiper motor. That's the only circuit breaker that I know of - but my truck has just about zero options. I suppose other options could've used a circuit breaker too.